diff --git a/archivist-client.gemspec b/archivist-client.gemspec
index cb2603a..9183525 100644
--- a/archivist-client.gemspec
+++ b/archivist-client.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency "roodi", "~> 2.1"
   gem.add_development_dependency "gem-release", "~> 2.0"
   gem.add_development_dependency "coveralls", "~> 0.8"
-  gem.add_development_dependency "rdoc", "~> 3.12"
+  gem.add_development_dependency "rdoc", "~> 6.0"
   gem.add_development_dependency "pry", "~> 0.11"
 
   gem.add_dependency "virtus", "~> 1.0"